EP1033225A2 - Düse zum Extrudieren von Schlauchfolien - Google Patents

Düse zum Extrudieren von Schlauchfolien Download PDF

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Publication number
EP1033225A2
EP1033225A2 EP00100009A EP00100009A EP1033225A2 EP 1033225 A2 EP1033225 A2 EP 1033225A2 EP 00100009 A EP00100009 A EP 00100009A EP 00100009 A EP00100009 A EP 00100009A EP 1033225 A2 EP1033225 A2 EP 1033225A2
Authority
EP
European Patent Office
Prior art keywords
inserts
ring
die
arranged around
die according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP00100009A
Other languages
English (en)
French (fr)
Other versions
EP1033225A3 (de
EP1033225B1 (de
Inventor
Gini Claudio
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tecno Coating Engineering Srl
Original Assignee
Tecno Coating Engineering Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tecno Coating Engineering Srl filed Critical Tecno Coating Engineering Srl
Priority to DK00100009T priority Critical patent/DK1033225T3/da
Publication of EP1033225A2 publication Critical patent/EP1033225A2/de
Publication of EP1033225A3 publication Critical patent/EP1033225A3/de
Application granted granted Critical
Publication of EP1033225B1 publication Critical patent/EP1033225B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/325—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles being adjustable, i.e. having adjustable exit sections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles

Definitions

  • This invention proposes a die for the extrusion of tubular films, fitted with improved devices for controlling and adjusting the thickness of the extrusion slit.
  • a die of a type comprising a central core and an outer ring defining an annular slit between them, through which the molten material is extruded, as well as suitable means for heating one or more sections of said ring so as to locally deform it and vary the thickness of the respective length of the annular slit, where certain devices, in particular inserts, are affixed to the structure next to said ring in such a manner that their opposite extremities are free to radially slide as a result of thermal expansion, and where moreover certain devices are available to mechanically attach the freely sliding extremities of the inserts to said ring, and some other devices are used to heat and/or cool one or more of said inserts, independently of each other.
  • this solution allows achieving a quicker and more precise adjustment of the annular slit, so as to produce a perfectly uniform film at the outlet of the die.
  • the molten plastic material is extruded through a die comprising a central core and an outer ring surrounding said core at a close distance, so as to define an annular slit through which the tubular film is extruded.
  • the molten plastic material is directed toward said slit through a number of channels provided at the interface of said core and said outer ring or sleeve, channels which are uniformly distributed over its entire perimeter and which are branching out when approaching the extruding slit.
  • the thickness of the tubular film is not perfectly uniform, for instance as a result of an irregular flow of the material.
  • Figure 1 illustrates, in a cross-sectional view, a known device for the localized adjustment of the extrusion slit.
  • the number 1 in Figure 1 indicates the core of the die, number 2 the body of the outer ring surrounding the core and number 3 the annular extrusion slit expelling the material.
  • a multiple number of inserts 4 are radially arranged around the ring and mounted on an annular supporting structure indicted by the number 5.
  • An adjusting screw 6 allows regulating the position of the inserts, by approaching or moving them away from the ring 2.
  • each insert holds an electrical resistance 23 and a conduit 7 allowing the passage of cooling fluid.
  • a certain space is allowed between the ring 2 and the insert 3, so as to allow the insert to freely expand when heated.
  • a tie-down element such as a small anchor 8 or similar rigidly connects each insert of the ring 3.
  • the insert In order to locally reduce the thickness of the extruded tubular material, the insert must in fact be heated so as to allow it to expand and push in the lip of the ring in the direction of the central core 1, thus slightly restricting the outlet slit 3.
  • a change in the slit diameter of about two tenths of a millimeter requires an insert temperature rise of about 100-150°.
  • this invention now offers an improved die, in which the inserts are tied to the structure on its inner side, meaning the side facing the core, while leaving their opposite extremities free to move next to the peripheral section.
  • the system will then operate in a manner opposite to that of the known devices, because the heating of the inserts will cause the width of the slit to increase, while a cooling of the respective inserts will cause the width of the passage to be decreased.
  • the heating action combines with the mechanical action, leading to a more efficient operation of the die, which allows achieving the desired purpose with a lower temperature change, and therefore also to act more quickly.
  • the number 10 of Figure 2 indicates the core of a die surrounded, as in the previous case, by a ring 11 so as to define between these two elements an annular slit capable of passing the molten plastic material which produces the tubular element.
  • the ring 11 presents a section of lesser thickness marked by the number 13, which allows the upper part of the ring to flex slightly, so as to allow the lip to approach or move away from the core.
  • the insert is blocked by a screw 16 at its extremity which is next to the lip 11 of the ring.
  • the screw 17 allows adjusting the position of the small anchor 18 and therefore of the lip 11 with respect to the insert 15.
  • the inside of the insert houses an electrical resistance 19 while providing some passages for a cooling fluid, shown by the numbers 21 and 22, respectively, one in the body of the insert and the other in the body of the small anchor 18.
  • the conduit 22 is permanently attached to a device of a known type for feeding and circulating the cooling fluid, so as to keep the small anchor at a constant temperature.
  • the fluid will be made to circulate only when it is necessary to cool the insert so as to achieve a direction of motion opposite to that induced by the heat generated by the resistance 19.
  • the operation is as follows: The molten plastic material is fed by some known equipment non shown in the figure and conveyed to the slit 12, from which it exits to form the tubular element.
  • the insert 15 must be heated.
  • the result is a more efficient die, capable of producing the desired results at much smaller thermal excursions than those normally needed with the known equipment, and in a shorter time period.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
EP00100009A 1999-03-01 2000-01-03 Düse zum Extrudieren von Schlauchfolien Expired - Lifetime EP1033225B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DK00100009T DK1033225T3 (da) 1999-03-01 2000-01-03 Stöbeform til ekstrudering af rörformet film

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1999MI000405A IT1309651B1 (it) 1999-03-01 1999-03-01 Filiera per l'estrusione di un film tubolare, migliorata
ITMI990405 1999-03-01

Publications (3)

Publication Number Publication Date
EP1033225A2 true EP1033225A2 (de) 2000-09-06
EP1033225A3 EP1033225A3 (de) 2001-10-31
EP1033225B1 EP1033225B1 (de) 2004-07-14

Family

ID=11382079

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00100009A Expired - Lifetime EP1033225B1 (de) 1999-03-01 2000-01-03 Düse zum Extrudieren von Schlauchfolien

Country Status (8)

Country Link
US (1) US6309201B1 (de)
EP (1) EP1033225B1 (de)
JP (1) JP2000246783A (de)
AT (1) ATE270950T1 (de)
DE (1) DE60012061T2 (de)
DK (1) DK1033225T3 (de)
ES (1) ES2222854T3 (de)
IT (1) IT1309651B1 (de)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29508824U1 (de) * 1994-07-12 1995-08-10 Tecno Coating Engineering S.R.L., Marano Ticino Örtlich deformierbare Ringdüse für die Herstellung schlauchförmiger geblasener Folien mit kontrollierter Dicke

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2654001C2 (de) * 1976-11-27 1986-02-06 Harald 5210 Troisdorf Feuerherm Vorrichtung zum Herstellen von aus thermoplastischem Kunstoff bestehenden Hohlkörpern
US4548570A (en) * 1983-05-12 1985-10-22 Cosden Technology, Inc. Extrusion apparatus for producing thermoplastic pipe
DE3778607D1 (de) * 1986-08-12 1992-06-04 Toshiba Machine Co Ltd Durch heizen einstellbare breitschlitzduese.
US5208047A (en) * 1990-05-09 1993-05-04 The Cloeren Company Apparatus for adjusting die lip gap
US5273421A (en) * 1990-05-29 1993-12-28 Ube Industries, Ltd. Injection type molding machine for producing hollow double wall type plastic articles
US5462423A (en) * 1993-04-13 1995-10-31 Sencorp Systems, Inc. Apparatus for non-mechanical die lip temperature adjustment in an extruder

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29508824U1 (de) * 1994-07-12 1995-08-10 Tecno Coating Engineering S.R.L., Marano Ticino Örtlich deformierbare Ringdüse für die Herstellung schlauchförmiger geblasener Folien mit kontrollierter Dicke

Also Published As

Publication number Publication date
ITMI990405A1 (it) 2000-09-01
EP1033225A3 (de) 2001-10-31
ES2222854T3 (es) 2005-02-16
ATE270950T1 (de) 2004-07-15
DE60012061D1 (de) 2004-08-19
EP1033225B1 (de) 2004-07-14
DK1033225T3 (da) 2004-11-22
IT1309651B1 (it) 2002-01-30
JP2000246783A (ja) 2000-09-12
US6309201B1 (en) 2001-10-30
DE60012061T2 (de) 2005-08-25

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